IMO, I wouldn't leave Barnes just because the SST may be cheaper or, that the posted BC is higher on the SST. It should be noted, that Barnes is a little conservative on what they list for their bullet's BC. I've spent hours discussing the BC with Barnes after running ballistics table after table, after shooting thousands of rounds of .50 TMZ's and they shoot much flatter than the posted BC and ballistics programs state is possible. Multipal shooters with different rifles and multipal rounds, all performing the same way. Confused about the results, I spent a couple hours with a math professor also, with him also trying to determine the possible results and why they were obtained as were. I also discussed the results with Bellm, who gave me a "possible", which relates to break-open rifles and most commonly found in centerfires.
For those who play with ballistics programs, here's the example: Shooting a 250gr Barnes TMZ, Blackhorn 209 @ 107.4grs VOLUME (75grs to the 1/10th by weight), rifles zeroed at 100yds and a 6" drop at 200yds. Rifles: T/C Encore Pro Hunter w/factory barrel....... Another T/C Encore Pro Hunter with a custom Bergara barrel and CVA Accura.
In no way am I saying that an SST is a junk bullet just because its cheaper. However, its reliability will not hold up to Barnes. Remeber the old saying: "You get what you pay for." If you do some searching on both bullets and compare some of the hunting results and performance of the bullets, you'll find many have had only moderate and even poor results from the SST. On the other hand, its extremely rare to find hunters complaining about any of the Barnes bullets and where you do find a complaint, its most generally caused by poor shot placement.
However, good shoot'n, have fun and be safe.